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| Title | Rank 🛈 | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|
| possible deadlock in xsk_bind bpf net | 4 | 18 | 234d | 292d | 0/29 | closed as dup on 2025/04/11 22:34 | |||
| possible deadlock in xsk_notifier (2) net bpf | 4 | 5 | 287d | 290d | 29/29 | closed as dup on 2025/04/12 22:10 | |||
| WARNING in netdev_nl_dev_fill net | -1 | C | done | 6471 | 284d | 288d | 0/29 | closed as dup on 2025/04/14 17:39 |
| Title | Replies (including bot) | Last reply |
|---|---|---|
| [syzbot] [net?] [bpf?] possible deadlock in xsk_diag_dump | 1 (2) | 2025/04/11 22:38 |
| Kernel | Title | Rank 🛈 | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
|---|---|---|---|---|---|---|---|---|---|---|
| upstream | possible deadlock in xsk_diag_dump (2) net bpf | 4 | 1 | 176d | 175d | 29/29 | fixed on 2025/10/09 01:15 |
======================================================
WARNING: possible circular locking dependency detected
6.15.0-rc2-syzkaller-00037-g834a4a689699 #0 Not tainted
------------------------------------------------------
syz.4.5508/18132 is trying to acquire lock:
ffff8880275066f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_diag_fill net/xdp/xsk_diag.c:113 [inline]
ffff8880275066f0 (&xs->mutex){+.+.}-{4:4}, at: xsk_diag_dump+0x61d/0x1660 net/xdp/xsk_diag.c:166
but task is already holding lock:
ffff888012e75c58 (&net->xdp.lock){+.+.}-{4:4}, at: xsk_diag_dump+0x162/0x1660 net/xdp/xsk_diag.c:158
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #3 (&net->xdp.lock){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
xsk_notifier+0xa4/0x280 net/xdp/xsk.c:1644
notifier_call_chain+0xb9/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2174
call_netdevice_notifiers_extack net/core/dev.c:2212 [inline]
call_netdevice_notifiers net/core/dev.c:2226 [inline]
unregister_netdevice_many_notify+0xe84/0x25a0 net/core/dev.c:11971
unregister_netdevice_many net/core/dev.c:12035 [inline]
unregister_netdevice_queue+0x305/0x3f0 net/core/dev.c:11887
unregister_netdevice include/linux/netdevice.h:3374 [inline]
_cfg80211_unregister_wdev+0x64b/0x830 net/wireless/core.c:1256
ieee80211_remove_interfaces+0x34e/0x720 net/mac80211/iface.c:2316
ieee80211_unregister_hw+0x55/0x3a0 net/mac80211/main.c:1681
mac80211_hwsim_del_radio drivers/net/wireless/virtual/mac80211_hwsim.c:5665 [inline]
hwsim_exit_net+0x3ac/0x7d0 drivers/net/wireless/virtual/mac80211_hwsim.c:6545
ops_exit_list+0xb0/0x180 net/core/net_namespace.c:172
cleanup_net+0x5c1/0xb30 net/core/net_namespace.c:654
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #2 (&rdev->wiphy.mtx){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
class_wiphy_constructor include/net/cfg80211.h:6092 [inline]
cfg80211_netdev_notifier_call+0x2bd/0x10f0 net/wireless/core.c:1547
notifier_call_chain+0xb9/0x410 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:2174
call_netdevice_notifiers_extack net/core/dev.c:2212 [inline]
call_netdevice_notifiers net/core/dev.c:2226 [inline]
__dev_close_many+0xff/0x770 net/core/dev.c:1671
dev_close_many+0x233/0x630 net/core/dev.c:1725
unregister_netdevice_many_notify+0x384/0x25a0 net/core/dev.c:11940
unregister_netdevice_many net/core/dev.c:12035 [inline]
default_device_exit_batch+0x853/0xaf0 net/core/dev.c:12527
ops_exit_list+0x128/0x180 net/core/net_namespace.c:177
cleanup_net+0x5c1/0xb30 net/core/net_namespace.c:654
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
-> #1 (&dev_instance_lock_key#3){+.+.}-{4:4}:
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
netdev_lock include/linux/netdevice.h:2751 [inline]
netdev_lock_ops include/net/netdev_lock.h:42 [inline]
xsk_bind+0x37c/0x15d0 net/xdp/xsk.c:1188
__sys_bind_socket net/socket.c:1810 [inline]
__sys_bind_socket net/socket.c:1802 [inline]
__sys_bind+0x211/0x260 net/socket.c:1841
__do_sys_bind net/socket.c:1846 [inline]
__se_sys_bind net/socket.c:1844 [inline]
__x64_sys_bind+0x72/0xb0 net/socket.c:1844
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
-> #0 (&xs->mutex){+.+.}-{4:4}:
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
xsk_diag_fill net/xdp/xsk_diag.c:113 [inline]
xsk_diag_dump+0x61d/0x1660 net/xdp/xsk_diag.c:166
netlink_dump+0x53b/0xd00 net/netlink/af_netlink.c:2309
__netlink_dump_start+0x6d6/0x990 net/netlink/af_netlink.c:2424
netlink_dump_start include/linux/netlink.h:340 [inline]
xsk_diag_handler_dump+0x1aa/0x240 net/xdp/xsk_diag.c:193
__sock_diag_cmd net/core/sock_diag.c:249 [inline]
sock_diag_rcv_msg+0x437/0x790 net/core/sock_diag.c:287
netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
sock_write_iter+0x4fc/0x5b0 net/socket.c:1131
do_iter_readv_writev+0x654/0x950 fs/read_write.c:825
vfs_writev+0x353/0xdc0 fs/read_write.c:1055
do_writev+0x295/0x330 fs/read_write.c:1101
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
other info that might help us debug this:
Chain exists of:
&xs->mutex --> &rdev->wiphy.mtx --> &net->xdp.lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&net->xdp.lock);
lock(&rdev->wiphy.mtx);
lock(&net->xdp.lock);
lock(&xs->mutex);
*** DEADLOCK ***
2 locks held by syz.4.5508/18132:
#0: ffff8880299256d0 (nlk_cb_mutex-SOCK_DIAG){+.+.}-{4:4}, at: __netlink_dump_start+0x150/0x990 net/netlink/af_netlink.c:2388
#1: ffff888012e75c58 (&net->xdp.lock){+.+.}-{4:4}, at: xsk_diag_dump+0x162/0x1660 net/xdp/xsk_diag.c:158
stack backtrace:
CPU: 0 UID: 0 PID: 18132 Comm: syz.4.5508 Not tainted 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2079
check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2211
check_prev_add kernel/locking/lockdep.c:3166 [inline]
check_prevs_add kernel/locking/lockdep.c:3285 [inline]
validate_chain kernel/locking/lockdep.c:3909 [inline]
__lock_acquire+0x1173/0x1ba0 kernel/locking/lockdep.c:5235
lock_acquire kernel/locking/lockdep.c:5866 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823
__mutex_lock_common kernel/locking/mutex.c:601 [inline]
__mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746
xsk_diag_fill net/xdp/xsk_diag.c:113 [inline]
xsk_diag_dump+0x61d/0x1660 net/xdp/xsk_diag.c:166
netlink_dump+0x53b/0xd00 net/netlink/af_netlink.c:2309
__netlink_dump_start+0x6d6/0x990 net/netlink/af_netlink.c:2424
netlink_dump_start include/linux/netlink.h:340 [inline]
xsk_diag_handler_dump+0x1aa/0x240 net/xdp/xsk_diag.c:193
__sock_diag_cmd net/core/sock_diag.c:249 [inline]
sock_diag_rcv_msg+0x437/0x790 net/core/sock_diag.c:287
netlink_rcv_skb+0x16a/0x440 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
sock_write_iter+0x4fc/0x5b0 net/socket.c:1131
do_iter_readv_writev+0x654/0x950 fs/read_write.c:825
vfs_writev+0x353/0xdc0 fs/read_write.c:1055
do_writev+0x295/0x330 fs/read_write.c:1101
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe25cb8d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe25d916038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fe25cda5fa0 RCX: 00007fe25cb8d169
RDX: 0000000000000001 RSI: 0000200000019440 RDI: 0000000000000004
RBP: 00007fe25cc0e990 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fe25cda5fa0 R15: 00007ffdc0b97708
</TASK>
| Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025/04/14 20:22 | upstream | 834a4a689699 | 0bd6db41 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-selinux-root | possible deadlock in xsk_diag_dump | ||
| 2025/04/12 12:46 | net | e861041e976b | 0bd6db41 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-net-this-kasan-gce | possible deadlock in xsk_diag_dump | ||
| 2025/04/08 21:52 | net | 69ae94725f4f | a775275d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-net-this-kasan-gce | possible deadlock in xsk_diag_dump | ||
| 2025/04/07 06:27 | net | 61f96e684edd | 1c65791e | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-net-this-kasan-gce | possible deadlock in xsk_diag_dump |